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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 198,547 | $ 172,832 | $ 549,670 | $ 485,936
Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,970 | 8,935 | 19,441 | 24,877
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 192,577 | 163,897 | 530,229 | 461,059
Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 101,191 | 80,844 | 278,433 | 223,348
Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 25,432 | 27,100 | 68,899 | 71,683
Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 21,941 | 18,291 | 56,723 | 50,212
Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,689 | 17,195 | 58,058 | 48,315
Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,191 | 11,757 | 33,254 | 33,905
Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,166 | 13,413 | 42,668 | 40,259
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,129 | 3,312 | 8,980 | 14,200
Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 808 | 920 | 2,655 | 4,014
Eastern |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,675 | 56,006 | 163,748 | 154,099
Eastern | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 36 | 128 | 123 | 500
Eastern | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,639 | 55,878 | 163,625 | 153,599
Eastern | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 41,868 | 36,392 | 115,363 | 101,544
Eastern | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,414 | 8,336 | 14,558 | 22,179
Eastern | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12,247 | 11,001 | 33,157 | 29,305
Eastern | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4 | 5 | 5 | 0
Eastern | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Eastern | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 142 | 272 | 665 | 1,071
Western |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 92,871 | 74,425 | 251,860 | 210,208
Western | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 186 | 233 | 673 | 847
Western | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 92,685 | 74,192 | 251,187 | 209,361
Western | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,323 | 44,452 | 163,070 | 121,804
Western | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,018 | 18,764 | 54,341 | 49,504
Western | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9,694 | 7,290 | 23,566 | 20,907
Western | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 461 | 875 | 1,243 | 3,271
Western | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Western | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,709 | 2,396 | 7,650 | 11,779
Western | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 666 | 648 | 1,990 | 2,943
Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 10,726 | 10,877 | 32,006 | 30,634
Recycling | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,592 | 7,436 | 15,768 | 20,311
Recycling | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,134 | 3,441 | 16,238 | 10,323
Recycling | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Recycling | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Recycling | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Recycling | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Recycling | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 10,726 | 10,877 | 32,006 | 30,634
Recycling | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Recycling | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Recycling | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,275 | 31,524 | 102,056 | 90,995
Other | Transferred at a point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,156 | 1,138 | 2,877 | 3,219
Other | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,119 | 30,386 | 99,179 | 87,776
Other | Collection |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Landfill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Transfer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Customer solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,689 | 17,195 | 58,058 | 48,315
Other | Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Organics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,166 | 13,413 | 42,668 | 40,259
Other | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 420 | 916 | 1,330 | 2,421
Other | Landfill gas-to-energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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